Forcing fsck and smartctl on Ubuntu

If you’re running into hard drive issues, sporadic error messages, or other problems, it’s time to backup and test your drive.
If you’re on a journaling file system ext4 or other, these errors might sometimes get corrected, but you need to replace your drive.
apt-get install smartmontools
smartctl -a /dev/sda1 (or your problematic drive)
Any errors or queued reads/writes [...]

Hard Drive Error on Ubuntu

I was randomly getting hard drive error messages.  UNC means UNCorrectable ERRor, …. not good.  These messages were like:
Feb 17 10:40:34 server04 kernel: ata1.00: cmd 60/f8:08:85:fe:dd/00:00:18:00:00/40 tag 1 ncq 126976 in
Feb 17 10:40:34 server04 kernel: res 40/00:10:7d:00:de/00:00:18:00:00/40 Emask 0×1 (device error)
Feb 17 10:40:34 server04 kernel: ata1.00: status: { DRDY }
Feb 17 10:40:34 server04 kernel: ata1.00: cmd [...]

Removing Ubuntu VM Network Interface

After a fresh install of Ubuntu 9.04,  you might have a network interface virbr0 if you’ve selected to install a virtual machine emulator.  During the CD install, selecting vm, it will install kvm and xen.  It will create a network interface virbr0 or virbr1 to perform host networking.
Later, if you decide to install VMWare or decide [...]